Means for reducing the freezing-point of oil.



UNITED sTA rEs PATENT OFFICE.

WILLIS R. WHITNEY, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERALELEU'IRIC I COMPANY, A CORPORATION OF NEW YORK.

MEANS FOR REDUCING THE FREEZING-POINT OF OIL.

Specification of Letters Patent.

Patented April 27, 1909.

To all whom it may concern:

Be it known that I, VVIL'LIS R. VVIIITN EY, a citizen of the UnitedStates, residing at Schenectady, in the county of Schenectady and Stateof New York, have invented certain new and useful Improvements in Meansfor Reducing the Freezing-Point of Oil, of which the following is aspecification.

In cases where the oil ordinarily'used in electric transformers,oil-switches, or the like, is used under conditions where freezing ofthe oil is to be feared, it has sometimes been found advisable tomixwith the oil a material which will reduce its freezing point.

'lhe qualities demanded of such a material are very hard to findcombined in a single substance. The material must, of course, in thefirst place mix intimately with the oil and reduce its freezing point.tilize readily since after a time it would be entirely driven off fromthe oil. It' must not decrease the insulating properties of the oil, normust it lower the flashing point which, in an oil of this character, isrelatively high. Certain materials have heretofore been used for thepurpose indicated but these have been found unsatisfactory by reason ofa lack of some of the qualities above mentioned. I have found, however,that benzyl chlorid,

It must not vola- E which is a hydrocarbon containing substiz:-

l tuted halogen atoms, is a satisfactory matei rial for mixture with oiland fulfils the exact- {ing requirements. This material is easily madefrom toluene and chlorin, and may be manufactured at moderate cost.

' \Vhat I claim as new and desire to secure by Letters Patent of theUnited States, is,

1. A low freezing point insulating fluid, consisting of high flashingpoint mineral oil mixed with a hydrocarbon compound containingsubstituted halogen atoms.

2. A low freezing point insi'ilating fluid, consisting of high flashingpoint mineral oil mixed with a hydrocarbon compound containingsubstituted chlorin atoms.

I 3. A composition of matter consisting of i oil and bcnzyl chlorid.

I 4. A low freezing point insulating fluid, E consisting of highflashing point mineral oil 1 mixed with a substance containing a halogeni and combined with carbon and hydrogen.

5 In witness whereof, I have hereunto set 1 my hand this 30th day ofSeptember, 1904. I

WILLIS R. WHITNEY.

! Witnesses: I HELEN ORFORD, I G. O. HoLLis'rnn.

